The answer is actually true. i just took the test and i put false and it was wrong
Answer:
Explanation:
To calculate the red shift you use the following formula:

\tetha: angle between the observer and the motion of the body
v: speed of the body
c: speed of light
for motion with angle 90° (transversal motion):

- A red dwarf moving away from Earth at 39.1 km/s :

- A yellow dwarf moving transversely at 15.1 km/s (angle = 90°):

- A red giant moving towards Earth at 23.3 km/s (angle = 0°):

- A blue dwarf moving away from Earth at 25.9 km/s
- A red dwarf moving transversely at 14.1 km/s

I’m guessing b because hydrogen is in your room and maybe eliminate to o but it also can be D
my final is: B!